Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire according to my new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a fragmentary enlarged view thereof; and,

FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6.

In the drawings, the portions of the tire and tread shown by broken lines are not claimed, and thus these portions form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 